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Showing posts with the label zero-day

A nasty pair of MySQL exploits grant attackers system root from any database user

Four days ago I received an email from Dawid Golunski through the list illustrating one of the more brutal pair of security vulnerabilities I have seen recently. Here's how it works.     The exploit uses a vulnerability within MariaDB, PerconaDB (and/or XtraDB Cluster) and MySQL to, first, gain access to the 'mysql' system user using any mysql user that has CREATE / INSERT / UPDATE permissions. The first part revolves around a race condition when sql generates temporary files as part of the `REPAIR table` command. Then using the mysql system user the second vulnerability grants the attacker root access to the server using a clever hack that takes advantage of mysql_safe's approach to writing to file based error logs. Below I've provided a list of vulnerable server versions. Just about any server using the more recent (unpatched) stable releases of MySQL or MariaDB through CentOS is vulnerable (Percona isn't part of the st

What You Need to Know About the "Sandworm" Exploit

You may have heard about last month's hack of computers belonging to NATO, Ukrainian and European Union representatives . The attack vector was a classic - a loaded email; classic enough that at first I wondered why the attacks were so successful, post-Stuxnet. Every target opened an email with an infected Microsoft Power Point document. The Power Point was executable. Under ordinary circumstances, users are provided with a security warning that they must over-ride when running and saving executable Power Points. I haven't been able to find confirmation in the news as to whether users read and confirmed these security warnings before running the loaded files; I haven't been able to get my hands on a copy of Sandworm to see for myself, either (please leave a message or email me if you have such a copy). In some sense, the incompetence entailed in triggering the infection is a bit more forgivable as apparently this infection has been running unabated since its first succe